The scheduled maintenance has been completed.

Scheduled maintenance is currently in progress. We will provide updates as necessary.

We will be undergoing scheduled maintenance during this time.

Maintenance will be performed on the Messaging API.
(Note that the end time of maintenance may change without notice.)

The maintenance will have these impacts.
1. Message status won't be updated during maintenance. →This endpoint won't be affected by the maintenance. (Updated on July 26, 2021)
2. Getting the number of messages sent from the previous day will be slower than usual.

We sincerely apologize for any inconvenience that this may cause and thank you for your understanding.
For more information, see the LINE Developers site.
https://developers.line.biz/en/news/2021/07/20/messaging-api-maintenance/